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參數(shù)資料
| 型號： | AD7314ARMZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 170K |
| 描述： | IC SENSOR TEMP 10BIT DGTL 8-MSOP |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部 |
| 感應(yīng)溫度： | -35°C ~ 85°C |
| 精確度： | ±1°C |
| 拓?fù)洌?/td> | ADC，寄存器庫 |
| 輸出類型： | MICROWIRE?，QSPI?，SPI? |
| 輸出警報： | 無 |
| 輸出風(fēng)扇： | 無 |
| 電源電壓： | 2.65 V ~ 5.5 V |
| 工作溫度： | -35°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
REV. A
AD7314
5
CIRCUIT INFORMATION
The AD7314 is a 10-bit digital temperature sensor. The part
houses an on-chip temperature sensor, a 10-bit A/D converter,
and reference and serial interface logic functions in an MSOP
package. The A/D converter section consists of a conventional
successive approximation converter based around a capacitor
DAC. The parts are capable of running on a 2.65V to 5.5 V
power supply.
The on-chip temperature sensor allows an accurate measurement
of the ambient device temperature to be made. The working
measurement range of the AD7314 is 35 C to +85 C.
CONVERTER DETAILS
The conversion clock for the part is internally generated so no
external clock is required except when reading from and writing
to the serial port. In normal mode, an internal clock oscillator
runs the automatic conversion sequence. A conversion is initi-
ated every 400 ms. At this time, the part wakes up and performs
a temperature conversion. This temperature conversion typically
takes 25 ms, at which time the part automatically shuts down.
The result of the most recent temperature conversion is avail-
able in the serial output register at any time. The AD7314 can
be placed in a shutdown mode, via the control register, in
which case the on-chip oscillator is shut down and no further
conversions are initiated until the AD7314 is taken out of shut-
down mode. The conversion result from the last conversion prior
to shutdown can still be read from the AD7314 even when it is
in shutdown mode.
In the automatic conversion mode, every time a read or write
operation takes place, the internal clock oscillator is restarted at
the end of the read or write operation. The result of the conver-
sion is available, typically 25 ms later. Similarly, when the part is
taken out of shutdown mode, the internal clock oscillator is
restarted and the conversion result is available, typically 25 ms
later. Reading from the device again before conversion is com-
plete will provide the same set of data.
Temperature Value Register
The temperature value register is a read-only register that stores
the temperature reading from the ADC in 10-bit twos comple-
ment format. The temperature data format is shown in Table I.
This shows the full theoretical range of the ADC from 128 C
to +127 C, but in practice the temperature measurement range
is limited to the operating temperature range of the device (35 C
to +85 C).
Table I. Temperature Data Format
Digital Output
Temperature (C) DB9 . . . DB0
128
10 0000 0000
125
10 0000 1100
100
10 0111 0000
75
10 1101 0100
50
11 0011 1000
25
11 1001 1100
0.25
11 1111 1111
0
00 0000 0000
0.25
00 0000 0001
10
00 0010 1000
25
00 0110 0100
50
00 1100 1000
75
01 0010 1100
100
01 1001 0000
125
01 1111 0100
127
01 1111 1100
Serial Interface
The serial interface on the AD7314 consists of four wires, CE,
SCLK, SDI, and SDO. The interface can be operated in 3-wire
mode with SDI tied to ground, in which case the interface has
read-only capability, with data being read from the data register
via the SDO line. The SDI line is used to write the part into
standby mode, if required. The CE line is used to select the
device when more than one device is connected to the serial
clock and data lines. To ensure that the serial port is reset prop-
erly after power-up, the CE must be at a logic low before the
first serial port access. The serial clock is active only when CE is
high. For correct data synchronization, it is important that the
CE be low when the serial port is not being accessed.
The part operates in a slave mode and requires an externally
applied serial clock to the SCLK input to access data from the
data register. The serial interface on the AD7314 is designed to
allow the part to be interfaced to systems that provide a serial
clock that is synchronized to the serial data, such as the 80C51,
87C51, 68HC11, 68HC05, and PIC16Cxx microcontrollers as
well as DSP processors.
A read operation from the AD7314 accesses data from the
temperature value register while a write operation to the part
writes data to the control register. Input data is not loaded into
the control register until the rising edge of the 15th SCLK cycle.
Data on the SDI line is latched in on the falling edge of the
serial clock while data is updated on the SDO line on the rising
edge of the serial clock.
Read Operation
Figure 3 shows the interface diagram for a serial read from the
AD7314. The CE line enables the SCLK input. A leading zero
and 10 bits of data are transferred during a read operation. Read
operations occur during streams of 16 clock pulses. Output data
is updated on the rising edge of SCLK. The serial data is accessed
in a number of bytes if 10 bits of data are being read. At the end
of the read operation, the SDO line remains in the state of the
last bit of data clocked out of the AD7314 until CE returns low,
at which time the SDO line goes into three-state.
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